As shown in the figure, a long straight conductor with semicircular arc of radius (π)/10 m is carrying current I =3 A. The magnitude of the magnetic…

As shown in the figure, a long straight conductor with semicircular arc of radius $\displaystyle \frac{\pi}{10} \mathrm{~m}$ is carrying current $\displaystyle \mathrm{I}=3 \mathrm{~A}$. The magnitude of the magnetic field. at the center O of the arc is : (The permeability of the vacuum $\displaystyle =4 \pi \times 10^{-7} \mathrm{NA}^{-2}$ )